//go:build !windows

package singleinstance

import (
	"errors"
	"path/filepath"
	"testing"
)

func TestAcquireWithFallbackUsesFallbackWhenPrimaryCannotOpen(t *testing.T) {
	tempDir := t.TempDir()
	primary := filepath.Join(tempDir, "missing", "privatevoice-input.lock")
	fallback := filepath.Join(tempDir, "fallback.lock")

	lock, err := acquireWithFallback(primary, fallback)
	if err != nil {
		t.Fatalf("acquireWithFallback() error = %v", err)
	}
	lock.Release()
}

func TestAcquireWithFallbackDoesNotBypassHeldPrimaryLock(t *testing.T) {
	tempDir := t.TempDir()
	primary := filepath.Join(tempDir, "privatevoice-input.lock")
	fallback := filepath.Join(tempDir, "fallback.lock")

	held, err := acquirePath(primary)
	if err != nil {
		t.Fatalf("acquirePath() error = %v", err)
	}
	defer held.Release()

	lock, err := acquireWithFallback(primary, fallback)
	if err == nil {
		lock.Release()
		t.Fatal("acquireWithFallback() unexpectedly acquired fallback while primary was held")
	}
	var unavailable lockUnavailableError
	if !errors.As(err, &unavailable) {
		t.Fatalf("acquireWithFallback() error = %T %v, want lockUnavailableError", err, err)
	}
}